In bad weather conditions, what should be the safe following distance?

Answer: D — At least 4 seconds

Maintaining a safe following distance in bad weather conditions is crucial for ensuring adequate reaction time and vehicle control. A following distance of at least 4 seconds allows drivers to account for factors such as reduced visibility, slippery roads, and longer stopping distances that are common in adverse weather conditions like rain, snow, or fog. This increased distance provides a buffer, giving drivers more time to react to unexpected situations, such as vehicles braking suddenly or obstacles appearing in the road. The 4-second rule takes into consideration the increased stopping distance required on wet or icy surfaces, making it a safer practice that can help prevent accidents. In contrast, shorter following distances may not provide enough time to stop safely, leading to a higher risk of collisions.